LiftMaster BG770 User Manual
The Chamberlain Group, Inc.
Elmhurst, Illinois 60126-1196
BG770 & BG790
INDUSTRIAL-DUTY BARRIER GATE OPERATOR
OWNER'S MANUAL
845 Larch Avenue
www.liftmaster.com
MODELS BG770 AND BG790 ARE FOR VEHICULAR PASSAGE GATES ONLY
AND ARE NOT INTENDED FOR PEDESTRIAN PASSAGE GATE USE
TABLE OF CONTENTS
WARNING
CAUTION
WARNING
SPECIFICATIONS
Operator Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Operator Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
OPERATOR WARNINGS
Safety Installation Information . . . . . . . . . . . . . . . . . . . . . . . . . . .4
PREPARATION
Carton Inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Site Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Operation Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
INSTALLATION
Pad Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Arm Fabrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Calculate Arm Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Wiring Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Arm Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
Arm and Turnbuckle Shaft Adjustments . . . . . . . . . . . . . . . . . . .10
Limit Switch Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
OPTIONAL ACCESSORIES
Vehicle Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Radio Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Card Readers, Keypads or Other. . . . . . . . . . . . . . . . . . . . . . . . . 12
Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
OPERATING INSTRUCTIONS
Electrical Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Manual Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
TROUBLESHOOTING
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Primary Voltage Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Low Voltage Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
General Reference Information . . . . . . . . . . . . . . . . . . . . . . . . . .15
IMPORTANT NOTES
• BEFORE attempting to install, operate or maintain the operator,
you MUST read and fully understand this manual and follow
ALL safety instructions.
• These instructions are intended to highlight certain safety
related issues. These instructions are not intended to be
comprehensive. Because each application is unique, it is the
responsibility of the purchaser, designer, installer and end user
to ensure that the total gate system is safe for its intended use
Mechanical
Electrical
When you see these Safety Symbols and Signal Words on the
following pages, they will alert you to the possibility of SERIOUS
INJURY or DEATH if you do not comply with the warnings that
accompany them. The hazard may come from something
mechanical or from electric shock. Read the warnings carefully.
When you see this Signal Word on the following pages, it will
alert you to the possibility of damage to your gate and/or the gate
operator if you do not comply with the cautionary statements that
accompany it. Read them carefully.
REPAIR PARTS
Illustrated Parts - Model BG770 . . . . . . . . . . . . . . . . . . . . . . . . .16
Repair Parts - Model BG770 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Illustrated Parts - Model BG790 . . . . . . . . . . . . . . . . . . . . . . . . .18
Repair Parts - Model BG790 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
MAINTENANCE
Limited Bearing Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Grease Turnbuckle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
WIRING DIAGRAMS
Single Phase Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Three Phase Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Control Connection Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . .23
WARRANTY POLICY AND SERVICE
. . . . . . . . . . . . . . . . 24
2
SPECIFICATIONS
MOTOR
Squirrel cage induction type (3 phase) or capacitor start
induction type (1 phase), continuous duty, 1725 RPM.
Horsepower is designated by second suffix of operator part
number.
-50; 1/2 Horsepower
POWER
Line voltage is designated by third suffix of gate part number.
For amp draw, see motor nameplate.
-11; 115Vac, 1 Phase, 60Hz
-21; 230Vac, 1 Phase, 60Hz
-81; 208Vac, 1 Phase, 60Hz
-83; 208Vac, 3 Phase, 60Hz
-23; 230Vac, 3 Phase. 60Hz
-43; 460Vac, 3 Phase, 60Hz
-53; 575Vac, 3 Phase, 60Hz
OPERATION
Prewired terminal strip accepts field connection of any access
control device with normally open (N.O.) output contact (most
access control equipment) and when required, a separate
OPEN/CLOSE pushbutton (provided).
Plug-in connectors are included for addition of a loop detector
to open and/or a loop detector to hold open (not provided).
Activation of access device open button, or loop detector to
open will raise gate. Gate will lower automatically unless hold
open loop detector is activated or unless CLOSE button wiring
has been made, in which case gate will remain open until
CLOSE button is pushed.
An optional timer will extend the time that the gate remains
open. AUTO/MANUAL switch holds arm in vertical position.
ENCLOSURE
Weatherproof, heavy gauge, pregalvanized steel, powdercoat
finish, top and side access covers with key lock.
ELECTRICAL
OVERLOAD PROTECTION
Automatic reset (3 phase operators) or manual reset (1 phase
operators) thermal overload.
ELECTRICAL BOX
NEMA 1 general purpose painted steel enclosure, contains all
motor control equipment. Enclosure removable from operator.
CONTROL CIRCUIT
Class II, 24Vac
LIMIT SWITCHES
Adjustable, driven limit switches, operate in class II circuit. Not
affected by removal of motor.
POWER ON/OFF SWITCH
Enclosed toggle switch, HP rated.
MECHANICAL
SPEED REDUCTION
Wormgear-in-oil-bath, 60:1
ARM TYPE
MODEL BG770: One piece type to 15'
MODEL BG790: Counterweighted wishbone type to 24'
ARM SPEED
MODEL BG770: Opens in 4 seconds
MODEL BG790: Opens in 11 seconds
LUBRICATION
Permanently lubricated bearings in motor. Low temperature
gear oil normally never needs replacement. Gear oil is
Mobil SHC 630 or equivalent.
MOUNTING
Pad mount
Model BG770 Model BG790
Typical
Installation
17"
35"
17"
44"
3
Counterweighted
Wishbone Arm
DIMENSIONSDIMENSIONS
Typical
Installation
17"
17"
Up to 24'Up to 15'
35"
22"
44"
OPERATOR WARNINGS
SAFETY INSTALLATION INFORMATION
1. Vehicular gate systems provide convenience and security. Gate systems are comprised of many component parts. The gate
operator is only one component. Each gate system is specifically designed for an individual application.
2. Gate operating system designers, installers and users must take into account the possible hazards associated with each individual
application. Improperly designed, installed or maintained systems can create risks for the user as well as the bystander. Gate
systems design and installation must reduce public exposure to potential hazards.
3. A gate operator can create high levels of force in its function as a component part of a gate system. Therefore, safety features
must be incorporated into every design. Specific safety features include:
• Gate Edges • Guards for Exposed Rollers • Photoelectric Sensors
• Screen Mesh • Vertical Posts • Instructional and Precautionary Signage
4. Install the gate operator only when:
a. The operator is appropriate for the construction and the usage class of the gate.
b. All openings of a horizontal slide gate are guarded or screened from the bottom of the gate to a minimum of 4' (1.2 m) above
the ground to prevent a 2 1/4" (6 cm) diameter sphere from passing through the openings anywhere in the gate, and in that
portion of the adjacent fence that the gate covers in the open position.
c. All exposed pinch points are eliminated or guarded, and guarding is supplied for exposed rollers.
5. The operator is intended for installation only on gates used for vehicles. Pedestrians must be supplied with a separate access
opening. The pedestrian access opening shall be designed to promote pedestrian usage. Locate the gate such that persons will not
come in contact with the vehicular gate during the entire path of travel of the vehicular gate.
6. The gate must be installed in a location so that enough clearance is supplied between the gate and adjacent structures when
opening and closing to reduce the risk of entrapment. Swinging gates shall not open into public access areas.
7. The gate must be properly installed and work freely in both directions prior to the installation of the gate operator.
8. Controls intended for user activation must be located at least six feet (6') away from any moving part of the gate and where the
user is prevented from reaching over, under, around or through the gate to operate the controls. Outdoor or easily accessible
controls shall have a security feature to prevent unauthorized use.
9. The Stop and/or Reset (if provided separately) must be located in the line-of-sight of the gate. Activation of the reset control shall
not cause the operator to start.
10. A minimum of two (2) WARNING SIGNS shall be installed, one on each side of the gate where easily visible.
11. For a gate operator utilizing a non-contact sensor:
a. Reference owner’s manual regarding placement of non-contact sensor for each type of application.
b. Care shall be exercised to reduce the risk of nuisance tripping, such as when a vehicle trips the sensor while the gate is
still moving.
c. One or more non-contact sensors shall be located where the risk of entrapment or obstruction exists, such as the perimeter
reachable by a moving gate or barrier.
12. For a gate operator utilizing a contact sensor such as an edge sensor:
a. One or more contact sensors shall be located where the risk of entrapment or obstruction exists, such as at the leading edge,
trailing edge and post mounted both inside and outside of a vehicular horizontal slide gate.
b. One or more contact sensors shall be located at the bottom edge of a vehicular vertical lift gate.
c. A hard wired contact sensor shall be located and its wiring arranged so the communication between the sensor and the gate
operator is not subject to mechanical damage.
d. A wireless contact sensor such as the one that transmits radio frequency (RF) signals to the gate operator for entrapment
protection functions shall be located where the transmission of the signals are not obstructed or impeded by building
structures, natural landscaping or similar obstruction. A wireless contact sensor shall function under the intended end-use
conditions.
e. One or more contact sensors shall be located on the inside and outside leading edge of a swing gate. Additionally, if the bottom
edge of a swing gate is greater than 6" (152 mm) above the ground at any point in its arc of travel, one or more contact sensors
shall be located on the bottom edge.
f. One or more contact sensors shall be located at the bottom edge of a vertical barrier (arm).
4
PREPARATIONS
WARNING
CARTON INVENTORY
1. Unpack the carton, checking for possible damage during
shipping. The arm (when provided) is packed separately.
Damage claims MUST be filed with the freight carrier.
2. Check that the nameplate data (inside service cover) accurately
matches the operator that was ordered.
3. Verify that the following parts are included with the standard
unit.
MODEL BG770 PACKING LIST MODEL BG790 PACKING LIST
PART NUMBER DESCRIPTION QTY
02-102 Open/Close Push Button 1
07-8007 Gate Arm Hub 1
10-8007M Gate Bracket 1
80-G0187 Key, 1/2 x 1/2 x 1-3/8 1
82-NH38-06 Cone Point Set Screw, 3/8-16 x 3/8 2
82-HN50-25 Hex Bolt, 1/2-13 x 2-1/4 4
82-RH-50 Hex Nut, 1/2-13 4
85-LS-50 Split Lock Washer, 1/2 4
01-G0674 Owner’s Manual 1
SITE PREPARATION
1. Be sure that selected gate location has required clearance for
arm movement (and counterweights on model BG790). Refer to
the dimensional drawings on page 3.
2. Run electrical power to the site according to local electrical
codes (Figure 1). See chart on page 7 for correct wire size and
length of run. If the wire gauge is too high (wire too small) or
the run is too long, the gate may not run properly or may not
run at all. Damage to components may result.
IMPORTANT NOTE: Be sure that the available power is the proper
voltage, phase, frequency, and amperage to supply the gate.
Refer to gate nameplate located inside the service cover.
3. Select locations for control equipment and run any control
wiring that may be needed (such as loop wires, card readers,
ticket spitters, pushbuttons, etc.).
To reduce the risk of SEVERE INJURY or DEATH, disconnect
power BEFORE performing ANY adjustments.
PART NUMBER DESCRIPTION QTY
02-102 Open/Close Push Button 1
07-8007 Arm Hub 2
10-8055 Counter Weight Clamp 2
80-G0135 Threaded Rod, 3/8-16 x 18 2
80-G0187 Key, 1/2 x 1/2 x 1-3/8 2
82-HN50-25 Hex Head Bolt, 1/2-13 x 2-1/4 12
82-HN50-28 Hex Head Bolt, 1/2-13 x 3 2
82-NH38-06 Cone Point Set Screw, 3/8-16 x 3/8 4
84-RH-50 Hex Nut, 1/2-13 14
84-WH-38 Serrated Flange Nut, 3/8-16 8
85-FW-38 Flat Washer, 3/8 8
85-FW-50 Flat Washer, 1/2 8
85-LS-50 Split Lock Washer, 1/2 16
01-G0674 Owner’s Manual 1
Figure 1
NOTE: Install line power here. Do not
install line power in panel shown below.
Power switch should be in the OFF position.
OPERATOR PREPARATION
1. Remove the wood base from the unit and discard.
2. Locate the keys for the access panel (taped to the arm
mounting flange) and remove.
3. Open the side access panel and check the position of the power
ON/OFF switch.
4. Open the cover of the electrical cabinet and be sure that the
AUTO/MANUAL switch is in the “AUTO” position.
5. OPTIONAL CONTROL EQUIPMENT: If loop detectors, radio
controls, or other control equipment will be added at the site,
do so now. Refer to the instructions in this manual for
installation of factory-provided optional open and/or hold open
loop detectors and for connection of factory-provided optional
radio controls (see Optional Accessories on page 12).
AUTO/MANUAL switch should
be in the “AUTO” position.
5
INSTALLATION
PAD MOUNTING
1. Layout the concrete pad (Figure 2). Be sure to locate electrical
conduit inside the hatched 14" x 13" area.
2. Excavate required area for pad and conduit. Pad depth should
be below the frost line or as required by local codes.
3. Pour concrete pad. Concrete pad should be level and above the
ground line.
4. Allow the concrete to set at least two days before installing
operator.
5. Secure operator with four concrete anchors (not provided).
ARM FABRICATION
MODEL BG770 (SINGLE ARM)
If you are making the arm yourself, refer to Figure 3 and its
suggestions for the single arm design.
1. Drill four 1/2" diameter holes using the arm clamp as a
template. Tapering the wood as shown helps reduce the
weight and allows you to reduce any warping common
with long lengths of lumber.
2. Cut to desired length. Refer to Calculate Arm Length below.
3. Finish arm with exterior grade paint and stripe with paint or
adhesive backed tape as required.
Figure 2
Conduit Entry Area
Arm
Figure 3
14-1/2"
Length as needed
up to 12'
20"
14"
13" 22"
12"
3"
Material:
6: x 1" Pine or Redwood
MODEL BG790 (WISHBONE ARM)
A 24' wishbone arm is provided as standard with every BG790
gate. If a shorter arm is desired, the extension may be shortened
(Figure 4). The maximum arm extension is 8' for a total arm
length of 24'.
1. Cut to desired length. Refer to Calculate Arm Length below.
2. Finish with an exterior grade paint and stripe with paint or
adhesive backed tape as required.
Figure 5
Arm length
Height of the
output shaft and
concrete pad (40")
Arm
Output Shaft
Height to
ceiling
5-12"
Length up to 8'
Figure 4
Material:
4: x 1" Pine or Redwood
Arm Extension
CALCULATE ARM LENGTH
To calculate the arm length:
Subtract the height of the output shaft and concrete pad (40")
from the height to ceiling (see Figure 5).
EXAMPLE:
If height to ceiling is 8'3" (99"), calculation is as follows:
99" (height to ceiling) - 40" (height of the output shaft and
concrete pad) = 59"
Lower arm should be 59".
6
INSTALLATION
WARNING
To reduce the risk of SEVERE INJURY or DEATH:
• ANY maintenance to the operator or in the area near the
operator MUST not be performed until disconnecting the
electrical power and locking-out the power via the operator
power switch. Upon completion of maintenance the area
MUST be cleared and secured, at that time the unit may be
returned to service.
• Disconnecting power at the fuse box BEFORE proceeding.
Operator MUST be properly grounded and connected in
accordance with local electrical codes. NOTE: The operator
should be on a separate fused line of adequate capacity.
• DO NOT install ANY wiring or attempt to run the operator
without consulting the wiring diagram. We recommend that
you install an optional reversing edge BEFORE proceeding
with the control station installation.
WIRING SPECIFICATIONS
SINGLE PHASE THREE PHASE
115 Vac 230 Vac 230 Vac 460 Vac 575 Vac
AWG Maximum Length of Wire Run in Feet
6 700 3,100 4,750 14,225 35,550
8 450 1,925 3,000 8,975 22,425
• ALL electrical connections MUST be made by a qualified
individual.
• ALL power wiring should be on a dedicated circuit and well
protected. The location of the power disconnect should be
visible and clearly labeled.
• ALL power and control wiring MUST be run in separate
conduit.
• BEFORE installing power wiring or control stations be sure to
follow ALL specifications and warnings described below.
Failure to do so may result in SEVERE INJURY to persons
and/or damage to operator.
• A ground screw is provided in the switch box for connection
of the power supply ground wire. Failure to properly ground
this unit could result in electrical shock and SERIOUS
INJURY.
10 275 1,225 1,900 5,650 14,075
12 175 775 1,175 3,525 8,825
WIRING CONNECTIONS
Locate the electrical enclosure inside the cabinet. The enclosure
(shipped loose) may be removed from the cabinet to help in the
connections described below. When all connections are complete,
hang the enclosure as described in step 7.
1. Open the cover of the electrical enclosure. Refer to the wiring
diagram supplied inside for all electrical connections.
2. Be sure that power supply is of the correct voltage, phase,
frequency, and amperage to supply operator. Refer to the
operator nameplate on electrical cabinet cover.
3. Connect power supply wires to the ON/OFF power switch as
shown on the operator wiring diagram. DO NOT connect power
at control panel (L1, L2, L3). Route wires away from belt and
limit switches.
4. A 2-button control station (OPEN/CLOSE) is provided as
standard equipment with every BG770 and BG790 barrier gate.
If you are not using automatic controls to control the gate, the
2-button control station may be connected as shown on the
wiring diagram supplied with the gate to control the gate
manually. However, the AUTO/MANUAL switch should be kept
in the “AUTO” position.
IMPORTANT NOTE: Use 16 gauge wire or larger for all control
wiring connections. If the control wire is too small, damage to
the operator components may result.
5. The control station must be mounted in a location adjacent to
and within clear sight of the gate. If you will mount the control
station outdoors, replace the standard station supplied with the
operator with a weatherproof station.
6. The BG770 and BG790 barrier gates will interface with almost
all types of commonly used control stations, radio controls, and
access control equipment. Refer to the wiring diagram for
connection of these devices.
If you are using a loop detector to open and/or hold open and
close, mounting space and plug-in harnesses are provided in
the electrical cabinet for installation of optional factory supplied
detectors. You may also use other detectors. Refer to the
Optional Accessories section on page 12.
7. When all wiring connections are complete, mount the electrical
enclosure to the shelf housing shelf. MODEL BG770: Hang
electrical enclosure on the two screws provided on the front of
the shelf in the housing. MODEL BG790: Hang electrical
enclosure on the two screws provided on the cross angle under
shelf in the housing.
7
INSTALLATION
WARNING
ARM ATTACHMENT
For easier access during installation, the top cover of the unit may
be opened by removing the two wing nuts from underneath,
inside the cabinet.
MODEL BG770: STANDARD ARM
Attach arm to the arm hub flange (Figure 5).
MODEL BG770: OPTIONAL ARM
Attach arm to the arm hub flange (Figure 6).
When following the procedure below, the motor belt will turn
and the drive shaft will move during some of the steps. Keep
hands and tools out of the gate cabinet and away from the
belt and drive shaft or SERIOUS INJURY may result. Be sure
to DISCONNECT power while installing the arm attachment.
Figure 5
Hub Flange
Gate Arm
Hex Bolt
1/2"-13 x 2-1/4"
Figure 6
(4) Hex Bolts
Extension Arm
S Screw
Lift Arm
See Detail A
See Detail B
Lock Washer and
1/2"-13 Hex Nut
Hex Bolt
(2) Flat Washers
DETAIL A
Threaded Rod
Hex Bolt
Flat Washer
DETAIL B
(2) Flat Washers
Hex Nut
Hex Nut
Hex Nut
Flat Washer
Threaded Spacer
Flat Washer
Flat Washer
Hex Bolt
8
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